Soft leather, clothing weight leather. The gunpowder wallet is greased, but I left the food bags incase the grease/oil should bleed/soak through and spoil the food. Some I stash inside my brass trade kettle which fits into my knapsack sideways. Any others go into the haversack (which is kosher for non military by the way!). I also made a bag/pouch for my tinderbox, and I did grease that. I made it with plenty of room so I could add just a few slivers of pine and dried grass. Close the flap, and fold the top down. No button, just a plain pouch. Not for carrying on the belt.
Regards, Keith.